I'm curious - is that with regards to specific types of games, or any/all? Not trying to sound combative or anything and feel free to tell me to fuck off if you don't want to say, I'm just trying to understand it.
Personally, I'm more into text-based games, and the specific sex acts don't matter so much to me as the fact that it's two (or more) women going at it. While the act is visually similar (and so I kinda get why it may be seen as lazy to do scenes with them, but it's not a dealbreaker for me), I find the dynamic is way different when it's someone with a penis trying to orgasm vs someone with a penis-like object trying to make someone else (or themselves) orgasm, and the difference is night-and-day in well written stuff. Though I don't exclusively like lesbian content so maybe something else is seeping in. I dunno for sure, but I find the thought processes behind this shit fascinating.
Particularly, I am not a fan of pure text game because English is not my mother tongue and that would make me miss some moments or nuances of the scenes for not fully understanding the language.
So, in particular, the pure text game might or might not have that kind of content since I'm not exactly the target audience.
Also, reading sex scenes doesn't appeal to me very much, because it's something that ends up getting repetitive over time.
Now, you said that you think someone with a penis trying to have orgasms is different and a person with a simulated penis trying to make someone else have an orgasm.
I mean, then, a game with a male character is, in general, a game with a selfish character who is trying to satisfy himself only. There is no need for an answer because we know that, in general, it is. It is always that rascal guy, with a huge penis and taking women with giant tits trying to corrupt the loving mother, the silly younger sister and the older sister who mistreats you. A really beaten cliché.
In lesbian games, most of them have some history and more emotion involved.
And if you think that a well-written sex thing involving a nice dildo, you may miss how well a well-written lesbian sex scene can actually be much more interesting and you may also find that the use of toys, strap on and etc. be a lazy resource.